EP 0629845 B1 19980819 - Pocket size laser power meter
Title (en)
Pocket size laser power meter
Title (de)
Taschengrösses Laserleistungsmessgerät
Title (fr)
Appareil de poche pour mesurer la puissance d'un laser
Publication
Application
Priority
US 7931893 A 19930617
Abstract (en)
[origin: EP0629845A1] A pocket size laser power meter adapted to measure the power of laser energy emitted by a laser. The power meter includes a thermal mass adapted to receive the laser energy. A temperature sensor coupled to the thermal mass translates temperature changes in the thermal mass into an electrical sensor signal having a variable voltage. A differentiator coupled to the temperature sensor receives the electrical sensor signal and produces a differentiated signal indicative of the rate of change of voltage of the electrical sensor signal. A cooling rate holding circuit coupled to the differentiator receives a cooling portion of the differentiated signal indicating a lowering of the temperature of the thermal mass. A heating rate holding circuit coupled to the differentiator receives a heating portion of the differentiated signal indicating a raising of the temperature of the thermal mass. A display meter coupled to the holding circuits adds the cooling and heating portions of the differentiated signal together, translates the differentiated signal into a power reading, and displays the power reading to a operator. <IMAGE>
IPC 1-7
IPC 8 full level
G01J 1/02 (2006.01); G01J 1/42 (2006.01); G01K 17/00 (2006.01)
CPC (source: EP US)
G01K 17/003 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0629845 A1 19941221; EP 0629845 B1 19980819; AT E169998 T1 19980915; AU 5932494 A 19941222; AU 673234 B2 19961031; CA 2120462 A1 19941218; CA 2120462 C 19970408; CN 1103485 A 19950607; DE 69412542 D1 19980924; DE 69412542 T2 19981224; IL 109307 A0 19940731; IL 109307 A 19961016; JP 2799290 B2 19980917; JP H0719957 A 19950120; US 5409314 A 19950425
DOCDB simple family (application)
EP 94109187 A 19940615; AT 94109187 T 19940615; AU 5932494 A 19940408; CA 2120462 A 19940331; CN 94105816 A 19940519; DE 69412542 T 19940615; IL 10930794 A 19940412; JP 6967094 A 19940407; US 7931893 A 19930617